Home / 19,513.20-29,271.40-8,420.40

Finding the Fourth Proportional to 19,513.20, 29,271.40 and 8,420.40

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Solution

The fourth proportional to 19,513.20, 29,271.40 and 8,420.40 is: 12,631.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,513.20 : 29,271.40 = 8,420.40 : x
  2. Step 2: Convert to fraction form
    19,513.20/29,271.40 = 8,420.40/x
  3. Step 3: Cross multiply
    19,513.20x = 29,271.40 × 8,420.40
  4. Step 4: Simplify right side
    19,513.20x = 246,476,896.56
  5. Step 5: Solve for x
    x = 246,476,896.56/19,513.20
  6. Step 6: Final answer
    x = 12,631.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.